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Anesth Analg 1992; 75:757-759
© 1992 International Anesthesia Research Society
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Preoxygenation of Pregnant and Nonpregnant Women in the Head-Up Versus Supine Position

Anis S. Baraka, MD, FCAnaesth(Hon), Myrna T. Hanna, MD, Samar I. Jabbour, MD, Maud F. Nawfal, MD, Abla A. N. Sibai, MS, Vanda G. Yazbeck, MD, Nawal I. Khoury, MD, and Karam S. Karam, MD

Departments of Anesthesiology, Obstetrics and Gynecology, and Epidemiology and Biostatistics, American University of Beirut, Beirut, Lebanon

The influence of preoxygenation in the supine (n = 10) versus the 45° head-up (n = 10) position on the duration of apnea leading to a decrease in arterial oxygen saturation to 95%, as monitored by pulse oximetry, was investigated in 20 women undergoing elective cesarean section at term of pregnancy. The results were compared with those obtained in a control group of 20 nonpregnant women. In the supine position, the average time to desaturation to 95% was significantly shorter in the pregnant group (173 ± 4.8 s [mean ± SD]) than in the control group of nonpregnant women (243 ± 7.4 s). Using the head-up position resulted in an increase in the desaturation time in the nonpregnant group (331 ± 7.2 s) but had no significant effect in the pregnant group (156 ± 2.8 s). We conclude that pregnant women desaturate their arterial blood of oxygen more rapidly than do nonpregnant women. Furthermore, the head-up position extends the duration of apnea that can take place before desaturation occurs in nonpregnant patients.




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Lippincott, Williams & Wilkins Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins and Stanford University Libraries' HighWire Press®. Copyright 1992 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999 HighWire Press
Copyright © 1992 by the International Anesthesia Research Society.